diff --git a/benchmark/bin/run_all.py b/benchmark/bin/run_all.py
index 7faf742..da6d9a3 100755
--- a/benchmark/bin/run_all.py
+++ b/benchmark/bin/run_all.py
@@ -10,7 +10,7 @@ import argparse
 def parse_args():
     parser = argparse.ArgumentParser()
     parser.add_argument('-l', "--langs", help="Add languages to test, ie: -l capnproto -l protobuf", action='append', default=['pycapnp', 'pyproto', 'pyproto_cpp'])
-    parser.add_argument("-r", "--reuse", help="If this flag is passed, re-use tests will be run", action='store_true',)
+    parser.add_argument("-r", "--reuse", help="If this flag is passed, re-use tests will be run", action='store_true')
     parser.add_argument("-c", "--compression", help="If this flag is passed, compression tests will be run", action='store_true')
     parser.add_argument("-i", "--scale_iters", help="Scaling factor to multiply the default iters by", type=float, default=1.0)
 
@@ -33,7 +33,7 @@ def run_one(prefix, name, mode, iters, faster, compression):
     data = {}
 
     if p.returncode != 0:
-        sys.stderr.write(' '.join(command) + ' failed to run with errors: ' + res + '\n')
+        sys.stderr.write(' '.join(command) + ' failed to run with errors: \n' + res + '\n')
         sys.stderr.flush()
     else:
         res = res.strip()
diff --git a/benchmark/catrank_pycapnp.py b/benchmark/catrank_pycapnp.py
index 4eab1db..a1cb67a 100755
--- a/benchmark/catrank_pycapnp.py
+++ b/benchmark/catrank_pycapnp.py
@@ -11,9 +11,14 @@ class Benchmark:
     def __init__(self, compression):
         self.Request = catrank_capnp.SearchResultList.new_message
         self.Response = catrank_capnp.SearchResultList.new_message
-        self.from_bytes_request = catrank_capnp.SearchResultList.from_bytes
-        self.from_bytes_response = catrank_capnp.SearchResultList.from_bytes
-        self.to_bytes = lambda x: x.to_bytes()
+        if compression == 'packed':
+            self.from_bytes_request = catrank_capnp.SearchResultList.from_bytes_packed
+            self.from_bytes_response = catrank_capnp.SearchResultList.from_bytes_packed
+            self.to_bytes = lambda x: x.to_bytes_packed()
+        else:
+            self.from_bytes_request = catrank_capnp.SearchResultList.from_bytes
+            self.from_bytes_response = catrank_capnp.SearchResultList.from_bytes
+            self.to_bytes = lambda x: x.to_bytes()
 
     def setup(self, request):
         goodCount = 0